While Nissan might be doing its happy dance today, Toyota isn't having quite as good a time. The automaker is expected to post its fifth straight quarterly operating profit decline as a weak yen, sour vehicle sales, and rising costs ravage its business. Global sales in the quarter were dragged down by a 28% decline in China and a one-third drop in the Middle East. [...] Toyota's sales in Oceania fell 16%, while those in Central and South America were ​down 5%. Some of Toyota's woes can also be attributed to the fact it can't get RAV4s out the door fast enough.